4.4-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 8de456cf87ba863e028c4dd01bae44255ce3d835 ]
CONFIG_DEBUG_OBJECTS_RCU_HEAD does not play well with kmemleak due to recursive calls.
fill_pool kmemleak_ignore make_black_object put_object __call_rcu (kernel/rcu/tree.c) debug_rcu_head_queue debug_object_activate debug_object_init fill_pool kmemleak_ignore make_black_object ...
So add SLAB_NOLEAKTRACE to kmem_cache_create() to not register newly allocated debug objects at all.
Link: http://lkml.kernel.org/r/20181126165343.2339-1-cai@gmx.us Signed-off-by: Qian Cai cai@gmx.us Suggested-by: Catalin Marinas catalin.marinas@arm.com Acked-by: Waiman Long longman@redhat.com Acked-by: Catalin Marinas catalin.marinas@arm.com Cc: Thomas Gleixner tglx@linutronix.de Cc: Yang Shi yang.shi@linux.alibaba.com Cc: Arnd Bergmann arnd@arndb.de Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- lib/debugobjects.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/debugobjects.c b/lib/debugobjects.c index a26328ec39f1..bb37541cd441 100644 --- a/lib/debugobjects.c +++ b/lib/debugobjects.c @@ -1088,7 +1088,8 @@ void __init debug_objects_mem_init(void)
obj_cache = kmem_cache_create("debug_objects_cache", sizeof (struct debug_obj), 0, - SLAB_DEBUG_OBJECTS, NULL); + SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, + NULL);
if (!obj_cache || debug_objects_replace_static_objects()) { debug_objects_enabled = 0;